/*
 * Copyright 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.aztec;

import java.util.List;
import java.util.Map;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.NotFoundException;
import com.google.zxing.Reader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;
import com.google.zxing.ResultPoint;
import com.google.zxing.ResultPointCallback;
import com.google.zxing.aztec.decoder.Decoder;
import com.google.zxing.aztec.detector.Detector;
import com.google.zxing.common.DecoderResult;

/**
 * This implementation can detect and decode Aztec codes in an image.
 *
 * @author David Olivier
 */
public final class AztecReader implements Reader {

	/**
	 * Locates and decodes a Data Matrix code in an image.
	 *
	 * @return a String representing the content encoded by the Data Matrix code
	 * @throws NotFoundException if a Data Matrix code cannot be found
	 * @throws FormatException if a Data Matrix code cannot be decoded
	 */
	@Override
	public Result decode(BinaryBitmap image) throws NotFoundException, FormatException, ReaderException {
		return decode(image, null);
	}

	@Override
	public Result decode(BinaryBitmap image, Map<DecodeHintType, ?> hints) throws NotFoundException, FormatException, ReaderException {

		NotFoundException notFoundException = null;
		FormatException formatException = null;
		Detector detector = new Detector(image.getBlackMatrix());
		ResultPoint[] points = null;
		DecoderResult decoderResult = null;
		try {
			AztecDetectorResult detectorResult = detector.detect(false);
			points = detectorResult.getPoints();
			decoderResult = new Decoder().decode(detectorResult);
		} catch (NotFoundException e) {
			notFoundException = e;
		} catch (FormatException e) {
			formatException = e;
		}
		if (decoderResult == null) {
			try {
				AztecDetectorResult detectorResult = detector.detect(true);
				points = detectorResult.getPoints();
				decoderResult = new Decoder().decode(detectorResult);
			} catch (ReaderException e) {
				if (e instanceof NotFoundException || e instanceof FormatException) {
					if (notFoundException != null) {
						throw notFoundException;
					}
					if (formatException != null) {
						throw formatException;
					}
				}
				throw e;
			}
		}

		if (hints != null) {
			ResultPointCallback rpcb = (ResultPointCallback) hints.get(DecodeHintType.NEED_RESULT_POINT_CALLBACK);
			if (rpcb != null) {
				for (ResultPoint point : points) {
					rpcb.foundPossibleResultPoint(point);
				}
			}
		}

		Result result = new Result(decoderResult.getText(), decoderResult.getRawBytes(), points, BarcodeFormat.AZTEC);

		List<byte[]> byteSegments = decoderResult.getByteSegments();
		if (byteSegments != null) {
			result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, byteSegments);
		}
		String ecLevel = decoderResult.getECLevel();
		if (ecLevel != null) {
			result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, ecLevel);
		}

		return result;
	}

	@Override
	public void reset() {
		// do nothing
	}

}
